Prior to being chosen as Padawan Learners, children being trained in the force spent time as Jedi Younglings. They were divided into ten clans of up to twenty younglings and trained in the Jedi arts. One of their rites of passage was “The Gathering,”which was the harvesting of kyber crystals for their lightsabers on the remote world of Ilum. The Jedi Younglings in the Jedi Temple during Order 66 were brutally slain by Darth Vader.